h
hussnainsajid79

Hussnain

@hussnainsajid79

Senior DOTNET Core API Developer, Secure Auth, OTP, Payment Systems

Pakistan
English
About me
Full-stack developer specializing in secure, scalable backend systems using .NET Core. I build production-ready REST APIs with clean architecture, strong security, and real-world usability. Skilled in JWT and OTP authentication (including Redis-based systems), payment integrations (Stripe, PayPal), and API integration with Angular and mobile apps (Flutter/React Native). I have delivered backend solutions for client projects, including auth systems, payments, and business applications. You get clean code, optimized APIs, documentation, and reliable delivery. ... Read more

Skills

h
hussnainsajid79
Hussnain
Offline • 
Average response time: 1 hour

See my services

API & Integrations
I will develop secure asp dotnet core web API with jwt authentication
From$15 / projectMore details

Portfolio

Work experience

Freelancer.com

Full Stack Developer

Freelancer.com • Freelance

Jul 2025 - Dec 2025 • 5 mos

I have worked as a Full Stack Developer specializing in .NET Core, Angular, and AI-based systems, where I contributed to multiple production-grade applications across different domains. I developed and maintained real estate platforms, e-commerce websites, and POS systems (both online and offline). I also worked on AI workflow automation solutions, including PDF data extraction using Azure services and AI APIs. My responsibilities included integrating payment gateways, optimizing database performance using stored procedures, indexing, and query tuning, as well as fixing critical bugs in existing systems. Additionally, I handled CI/CD pipeline setups, IIS server deployments, and full application hosting, ensuring stable and scalable production environments.